Nut-lock.



PATENTED MAY 1, 1906.

NUT LOCK.

APPLICATION FILED r1212. 15. 1905.

G. HARWELL.

mun

UNITED STATES PATENT OFFICE.

NUT-LOCK- Specification of Letters Patent.

Patented May 1, 1906.

Application filed February 15,1905. Serial No. 245,763.

[0 all 'u'iz/um/ [f 71mg concern:

Be it known that I, GALVESTON HARWELL, a citizen of the United States,residing at Cartersville, in the county of Bartow and State of Georgia,have invented a new and useful Nut-Lock, of which the following is aspecification.

This invention relates generally to nutlocks, and particularly to animproved construction of locking device specially adapted for holdingtight the nuts arranged upon the bolts employed for uniting the ends ofrailroad-rails. It is obvious, however, that my construction of nut-lockis also suitable for use in bridging, building, and structures ofsimilar character.

The object of my invention is to provide a simple and efficient form ofnut-lock which will hold the nut from reverse rotation, and a stillfurther object is to provide a device which can be easily desired toremove the nut.

With these objects in view my invention consists, essentially, in theemployment of a slotted washer-plate having a central portion to which aspring locking-plate is attached, said l i cl ing-plate having two armstwisted at their outer ends and adapted to engage the under side of thenut for the purpose of holding said nut against reverse rotation.

The invention consists also in certain details of construction andnovelties of combination, all of which will be hereinafter fullydescribed, and pointed out in the claim.

In the drawings forming a part of this specification, Figure 1 is a viewshowing the practical application of my invention. Fig. 2 is a sectionalview, partly in top plan. Fig. 3 is a detail elevation of the washer.Fig. 4 is a detail perspective view of the spring locking-plate.

Referring to the drawings, A indicates a section of railroad-rail, and Bthe fish-plates of ordinary construction.

O is a washer-plate having bolt-openings C, and communicating with saidopenings are the longitudinal slots C thus leaving a central portion C,which is provided with a central stud C", the purpose of which willappear hereinafter.

D indicates a spring locking-plate comprising the central circularportion and the oppounlocked whenever it is sitely-extending arms D,said arms being made somewhat thinner at their outer ends and twisted inreverse directions, as most clearly shown at D", said twisted ends beingadapted to serve as pawls and engage the inner face of the nut F,screwed upon the threaded end of the bolt E. The central circularportion of the spring-plate has an aperture D through which the stud Cpasses, said stud being headed or hammered down, as most clearly shownin Fig. 2, for the pur pose of securely connecting the spring-plate tothe washer. Thus it will be seen that after the fish-plates and boltshave been arranged the washer-plate carrying the spring lockingplate isarranged upon the bolts, and the nuts are then screwed down until theybind against the free ends of the locking-plate or against the twistedends of the arms which form a part of said plate. Owing to the positionof these ends and the engagement of the nuts therewith, said nuts willbe held securely against reverse rotation; but when it is de sired todisengage the nut the arm D is pressed inwardly, forcing the end D awayfrom the nut, which can then be easily unscrewed.

It will thus be seen that I provide an ex ceedingly cheap, simple, andeflicient construction of nut-lock which will effectively hold the nutsin a locked position after they have once been properly screwed down.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

A nut-lock comprising a washer-plate havingbolt-openings, andlongitudinal slots communicating with said openings, the central portionof said washer-plate having a stud projecting therefrom, a locking-platehaving a central opening through which the stud of the washer-plate isadapted to pass and oppositely-extending spring-arms twisted in reversedirections adjacent their outer ends, said twisted ends being adapted toengage the inner face of the nuts to be looked as set forth.

GALVESTON HARWELL.

Witnesses CHAS. W. SPRoULL, A. O. VVILLIAMS.

